Nail-on electric fence insulator



FIG. 1 is a perspective view of an electric fence insulator embodying our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view taken from the right in FIGS. 1 and 2;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof, and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for an electric fence insulator, substantially as shown. 